Numerical investigation of laminar separated flow through a channel with symmetric double expansion

• Published in: Acta mechanica Vol. 179; no. 3-4; pp. 197 - 210
• Main Authors: MAIKAP, T. K, MAHAPATRA, T. R, NIYOGI, P, GHOSH, A. K
• Format: Journal Article
• Language: English
• Published: Wien Springer 01.11.2005; New York, NY Springer Nature B.V
• Subjects: Exact sciences and technology; Flow control; Flows in ducts, channels, nozzles, and conduits; Fluid dynamics; Fundamental areas of phenomenology (including applications); General theory; Geometry; Numerical analysis; Physics; Turbulent flow; Transformation of coordinates; Turbulent flow; Pipe flow; Flow separation; Reynolds number; Poisson equation; Double series; Incompressible flow; Infinite medium; Asymmetry; Laminar flow; Modelling; Incompressible fluid; Separated flow; Viscous fluids; Viscous flow; Navier-Stokes equations; Finite difference method
• ISSN: 0001-5970; 1619-6937
• DOI: 10.1007/s00707-005-0255-x

Two-dimensional Navier-Stokes equations have been solved numerically by a finite difference technique on a staggered grid for investigating the laminar flow of an incompressible viscous fluid through a channel with symmetric double expansion. A coordinate transformation has been employed to map the infinite irregular domain into a finite regular computational domain. At higher Reynolds numbers the flow becomes time-dependent and asymmetric. Such unsteadiness and asymmetry remains in the flow even up to turbulent flow conditions. The Pressure-Poisson equation has been solved and a pressure-velocity correction scheme has been invoked. Depending on the geometry and Reynolds number, secondary separation has been observed. [PUBLICATION ABSTRACT]